So PPP depends on a basket of goods, and it seems to be assumed that there is one such basket. But obviously there is none such unique basket: In different countries and in different socioeconomic strata there are very different "typical" baskets of goods - so how to compare these, across countries and strata?

In other words (and trying to be specific): What exactly does it mean (according to the official definition) when it is for example said that an Indian farmer (let his name be Kalu) in the state of Rajasthan who

exhibits typical consumer behaviour (= has a typical basket of goods, including spendings on religious festivals)

is partially self-supplying

does a second job as a tourist camel guide

does a third job as a quarryman

has a monthly income of 10,000 rupies (averaged over a year)

lives on $X per day (measured at PPP exchange rate)?

But first of all:

How exactly would I calculate X - given the information above + the
size/structure of his household?

$\begingroup$PPP calculations between countries are typically based on information collected for consumer price inflation (CPI) and other price calculations within countries. In neither case is the typical basket of goods and services supposed to be specific to individuals but instead be representative of costs across the economy$\endgroup$
– HenryOct 23 '19 at 8:09

$\begingroup$@Henry: But the daily income measured at the PPP exchange rate is supposed to be specific to individuals, isn't it?$\endgroup$
– Hans-Peter StrickerOct 23 '19 at 8:16